At 11.8 volts you are probably into the damage area if your batteries are lead. If lithium they are still way to low. Could you at least pull a vehicle close enough to use jumper cables. Or borrow/rent/buy a small generator? I would stop using the batteries to prevent further damage.
If none of the above will work you need to go somewhere where there is a place to plug in to get the battery back up to a safe area. Sorry your trip is not going well but if none of the above are possible it is time to go home or to a place where you can plug in.
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2017 SLX 195RB
2021 Jeep Grand Cherokee Summit L 5.7L V8
Andersen WDH hitch, Renogy 100 AH Lithium &
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